Improvement in car-trucks



' Y I 2 Sheets-Sheet 2. G. VINGENTXv M. A. W.HEATON. Oar-Truck.-

No. 201,3i0. Patented March 12,1873.

Inventors Witnesses I I NFETERS. PNOTO-UTHOGRAPHER. WASHINGTYONZ [2.0.

I NI ED S TE PATENT OFFICE."

fenonen vINoE Nn-o'r s'r'ocxron, AND'MILTON A. .wHnA'roN, or SANFRANCISCO, CALIFORNIA.

IMPROVEMENT IN CAR-TRUCKS.

Specification forming part of Letters Patent N 0. 201,310, datedMarch12,1878; application filed 1 December 24, 1877.

To all whom it may concern: v

Be it known that we, GEORGE VINCENT, of Stockton, California, and MILTONA. WHEA- TON, of San Francisco, in the State of California, haveinventedcertain new and useful Improvements in Railroad-Trucks; and do herebydeclare that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawing and to theletters of reference marked thereon, making a part of thisspecification.

Our invention relates to six-wheeled cartrucks and itconsists in theconstruction and arrangementof devices whereby the end sets of thetruck-axles move laterally and pivot horizontally at the same time, andact as soon as they enter from a straight line to a curve, as will behereinafter more fully set forth.

In the annexed drawings, Figure 1 is a bottom view of a car-truckembodying our invention. Fig. 2 is a side elevation of the same. Fig. 3is a detailed bottom view thereof; and Figs. 4, 5, and 6 are enlargeddetailed views of parts of our invention.

A represents the main truck-frame. B B and D D are the two end sets oftruck-wheels, and C O is the middle set of truck-wheels, secured,respectively, on the axle 13,11, and 12. E is an independent vibratingframe. H is an independent stationary frame. J J are the pedestals. K isthe arm of an axle, and L M are friction-collars thereon. P is a pivotupon which the frame E vibrates. I I are the carrying-springs. 2 is ametal plate, provided with a curved groove, 3, with a slide, 4, fittedtherein. 5 is an outer box, having vertical grooves 6, by means of whichit is held in its position by guides 7 of the pedestals J. 8 is abox-case, of cast-steel or other hard material. 9 is the journal uponwhich the box-case 8 pivots, and 10 is a babbitted box in which theaxle-journal turns.

In order to make the wheels upon each side of the trucks follow eachother easily in the line of the curve around which the truck may bepassing, it is necessary that the axles should be in a line with theradii of the curve; and in order that the axles may conform to thevarious lines of the different radii of changing curves, when the middleaxle has no lateral movement in the truck, it is necessary that each endaxleshould swing horizontally around a point midway between such endaxle and the middle axle.

The independent frame H may be made of a single piece of metal, bent insuitable form, and having its ends attached to the boxes of the middleaxle 12. The frame E is made in endwise in the curved slot or groove 3of the plate 2, which is held in the upper part of the outer box 5, andthis box held in the pedestal J, as described. The groove 3 is made onthe arc of a circle havingthepivotP for its center.

As the frame H is stationary, it is obvious that the same may bedispensed with, and the frame E pivoted to a cross-bar in thetruckframe, as shown in Fig. 3.

The ends of the frame E are perforated so as to allow the journals 9 topass through and connect said frame with the boxes.

When the truck passes from a straight line upon a curved track the curveof the track presses the forward wheels laterally out of a straight linewith the truck. This pressure is resisted by the middle wheels, whichact as a fulcrum, and impart the lateral pressure to the hind wheels.Both the forward and hind wheels yield to this pressure and movelaterally in the truck and out of a straight line with the middlewheels, carrying their axles with them. By means of the journal 9,grooves 3, slide 4, and frame E, the ends of the axles are thencompelled to follow the circular direction of the grooves 3, whichdirection is exactly the same andjdentical with the direction of theends of the frame E as it moves around the pivot P.

By these means a compound movement is imparted to the axles 11 and 13.They not only move endwise, but one end of each axle goes forward whilethe other end goes backward in the truck; and said compound movementsare on the line of a circle having its center at the pivot P. I

It is, of course, understood that a frame, E, is to be used inconnection with the axle 13 as well as with the axle 11.

The wheels on each side of the truck will follow each other in aline'with the track upon which they are running, whether such line isstraight or curved, and if such line is a curve the axles of the truckwill automatically fall in line with the radii of such curve.

The axle-journal K is provided with collars L and M, fastened thereon,for the purpose of presenting a greater bearing or. friction surfaceagainst the case 8.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is

1. The combination of the outer case 5, plate 2, with curved groove 3,slide 4, and box 8,

1 with journal 9, whereby the car-axle obtains a compound lateral andbackward and forward movement, substantially as herein set forth.

-2. The frame E, pivoted centrally between the axles, and connected atits end with the journals 9 of the boxes 8, in combination with theslides 4 and plates 2, with curved grooves 3, for the purposes setforth.

In testimony that we claim the foregoing we have hereunto set our handsthis 12th day of December, 1877.

GEORGE VINCENT. MILTON A. WHEATON.

Witnesses:

GRoWsoN SMITH, M. QSOUTHARD.

